#include<cstdio>
int main(){
	int n, m;
	while (scanf("%d%d", &n, &m) != EOF){
		if (n == 0 && m == 0){
			break;
		}
		int ans = 0;
		for (int i = 0; i < m; i++){
			int k = n - i;
			while (k % 2 == 0){
				ans++;
				 k= k / 2;
			}
		}
		printf("%d\n", ans);
	}
}